System and method for calibrating errors of watt-hour meters

Abstract

The invention discloses a system and a method for calibrating errors of watt-hour meters. The system comprises a relay switch board, an AD sampling module, a 6.4 K external interrupt trigger pulse acquisition module, a pulse capture module, a first processor, a second processor, a dual-port RAM (random access memory) and a display terminal module, wherein multiple paths of voltage-current signals access the relay switch board, the relay switch board is connected with the input end of the AD sampling module, the output end of the AD sampling module is connected with the first processor through a data bus, the 6.4 K external interrupt trigger pulse acquisition module and the pulse capture module are both connected to the first processor, the first processor is connected with the second processor via the dual-port RAM through a data bus, and the second processor is connected with the display terminal module and the relay switch board. According to the invention, multiple 0.2-level gateway watt-hour meters can be simultaneously subjected to error calibration, and the vector diagram and primary waveform of each to-be-calibrated watt-hour meter can be recorded, so that the working efficiency is high, and the space utilization rate is high; and the precision of the calibration system can reach 0.05 level.

Description

technical field [0001] The invention relates to the field of electric energy measurement, in particular to a high-voltage electric energy meter error verification system and a verification method, which protect the economic interests of both power suppliers and consumers. Background technique [0002] Electric energy metering is the core of the operation of electric power enterprises, and the value of electric energy is reflected by the metering device. The measurement accuracy of the electric energy metering device directly affects the economic interests of both the electricity supplier and the electricity consumer. Therefore, at this stage, power supply enterprises generally carry out periodic on-site verification of the measurement errors of electric energy metering devices. [0003] According to statistics, the total number of high-voltage electric energy metering devices in my country is more than 4 million (sets), of which the voltage level of 6-35kV accounts for more...

AI Technical Summary

Problems solved by technology

For the error verification of the electric energy meter, the standard meter method is generally used, that is, the electric energy value measured at the same time by the standard meter and the electric energy meter is compared to determine the relative error of the electric energy meter. If the relative error is greater than the accuracy of the electric energy meter, it means that the electric energy meter cannot accurate measurement

[0004] There are many reasons for the error of the electric energy meter, such as: light-load operation of the electric energy meter, excessive secondary voltage drop, tilting of the electric energy meter, wrong wiring, etc., and the relative error value can only indicate whether the electric energy meter is accurate or not. The existing on-site calibration The inspection system does not record the original data of the energy meter operation, which lacks practical guidance for guiding the operation and maintenance of the energy meter

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